Nut-machine.



E. HOLLINGS. NUT MACHINE.

APPLICATION FILED OCT. 2. I916.

Patented Feb. 5, 1918.

2 suusrs-sunqn E. HOLLINGS.

NUT MACHINE.

APPLICATION FILED 0612.1916.

Patented Feb. 5, 1918.

2 SHEETS-SHEET 2- I Lg ERNEST HOLLINGS, 0F CLEVELAND, OHIO.

NUT-MACHINE.

Specification of Letters Patent.

Patented Feb. 5, 1913 Application filed October 2, 1916. Serial No. 123,290.

To all whom it may] concern:

Be it known that I, ERNEST T'IOLLINGS, a subject of the King of England, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Nut-Machines,

of which the following is a specification.

This invention relates to nut forging machines. The object of the invention is to provide improved means for cooling the punches and dies to increase their life and working ability and secure maximum efliciency; and to also improve the construction and arrangement of the punch guiding de vices to decrease the friction. and wear and support the tools more firmly and ri idly.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

The invention comprisesthe nut machine hereinafter described and claimed.

In the drawings, which represent one embodiment of the invention, Figure 1 is a longitudinal sectional elevation on the line 11, Fig. 2 looking in the direction of the arrows; Fig. 2 is a cross section on the line 22, Fig. 1, looking in the direction of the arrows; Fig. 3 is a longitudinal sectional view, on a larger scale, through the left hand set of punches in Fig. 1, and showing the water feed; Fig. 4 is a cross section on the line 4l-, Fig. 3; and Fig. 5 is a detail plan view of the die holder.

The machine shown in the drawings comprises a suitable frame 1 provided with j ournal bearings for the three cam shafts, 2, 3 and 4.- for reciprocating the tools, and the main driving shaft 5 provided with the driving pulleys 6. Shaft 5 has a gear 7 meshing with two gears 8 on the cam shafts 3 and i, and gear 8 on shaft 3 meshes with a gear 9 on shaft 2, so that all the cam shafts rotate simultaneously and at the same speed.

On the frame is a work rest 10 along which the bar of stock is fed to an adjustable stop device 11 lying on the opposite side of the punches and dies. Above and below the path of feed of the bar are two indenters 12 which nick the edges of the bar and partially shape the blank to hexagonal form preparatory to cutting it off. Said indenters are carried by heads 13 moving vertically in the frame and reciprocated by the cams 14 on the shaft 3.

The blank lies in front of the hexagonal opening 15 in a hollow die block 16. It is sheared from the bar and carried into the die block by one of a pair of hexagonal hollow plungers 17, 1" located in endwise aline ment with each other and in the bores of which slide the punches 18, 18 Said plungers are held in blocks 19, 19 of like corn struction which are bolted to slides 20, 2O traveling in horizontal guides in the frame. Both of said slides are provided with guideways to receive the sliding blocks 21, 21 to which the punches are secured, said punches projecting through the blocks 19. 19 and sliding in the bores of the plungers. Punch block 21 is reciprocated by a cam 22 on shaft 2, which engages a roller 23 on the punch block for advancing said block in one direction and a roller 2% on one arm of a lever 25 whose other arm 26 lies in front of said roller 23 for retracting the block. The plunger block 19 is advanced by cam 27 engaging a roller 27 on said block, and is retracted by the rearward movement of the punch block a shoulder 28 on which engages a cross bar 29 on the plunger block.

Plunger block 19 is reciprocatcd by a crank pin 30 on shafts while punch block 21 is advanced by the cam 31 and retracted by the plunger block in. which it slides.

lilach. of the plunger blocks 19, 19 is of the form shown in Figs. at and 5 comprising a body having holes 32 for receiving the clamping bolts for securing it to the slide and a longitudinal bore having a large portion 33 to receive the base of the plunger and a smaller portion 34: to receive and guide the sliding punch. The larger portion of the bore is in the front of the block which has an upwardly extending portion 35 and a longitudinal kerf 36 the block being bored and tapped to receive a clamping bolt 37. The kerfed and enlarged portion of the block is partially separated from the solid body by a transverse kerf 38. With this construction the plunger can be frictionally clamped in its socket without straining or disturbing the solid punch guiding portion.

As shown in Fig. 3 the bore in the rear end of the plunger 17 is larger than the working end of the punch 18 whose body 29 is larger than its forward end. This leaves a cavity 40 within the plunger around the punch therein which is filled more or less by said punch as its large body enters or recedes from said cavity. The reciprocating motion of the punch in the plunger is taken advantage of by me for circulating or sup? When the punch advances said water 1s forced outwardly between the punch and plunger and cools the working parts of the j i flow of the water to the supply pipe although tools. The check valve 43 prevents back even without said valve the water under pressure wlll flow through the cavity and to the tools. Preferably also a short sleeve or bushing 44 is interposed between the plunger block and the sliding punch, said sleeve 'beingclampe'd to the punch by a split clamp 45 and projecting into the cavity 40 and serving an extended guide or hearing for the body of the punch as it moves through the block. This enables the tool end to be reduced to the smallest practicable size with the same sized body. The sleeve 44 is not essential on the right hand punch, Fig. 1, and. may be omitted, as shown.

,Water may also be directed against the opposed faces or ends of the plunger, punches and indenters for which purpose I provide two nozzles 46 directed toward the same and connected to pipes 47 supported on the frame and communicating with a water supply. 7

The machine "described operates in the usual manner. One of the plungers shears off a blank and carries it into the die where it is compressed, forged and expanded to fill out to hexagonal shape after which one punch pierces the blank. The blank is then ejected from the die and the punching from the opposite plunger. The constant water supply cools the tools and increases their life.

What I claim is:-

, 1. A nut forging machine, comprising a die block, a hollow plunger, a punch working in a chamber therein, a portion of said chamber being larger in cross sectional area than the punch, and means for supplying water to the chamber within said plunger.

A nut forging machine, comprising a die block, a hollow plunger, a punch working therein, meansfor supplying water to the space within said plunger, and a bushing on the punch and within said plunger.

8. A nut forging machine, comprising a die block, a hollow plunger working therein and provided with a cavity, a solid punch sliding in said cavity and arranged to vary its effective volume, and means for suppl v ing water to said cavity.

4. A nut forging machine, comprising a die'block, a hollow plunger working therein and provided *ith a cavity, a punch sliding in said cavity and arranged to vary its efiective volume. means for supplying water to said cavity, and a. guiding sleeve entering said cavity.

5. A nut forging machine, comprising a die block, two hollow plungers in line with each other, punches therein, means for reciprocating said punches and plungers, and means for supplying water under pressure to said plungers.

6. in a nut machine, a hollow plunger, a block supporting the same, said block having a slit portion for receiving and clamping said plunger and a solid body portion provided with a guiding bore, and a punch extending through said bore into said plunger.

In testimony whereof I affix my signature.

ERNEST HOLLIN'GS.

Copies 'of this patent may be obtained for five centseach, by addressing the Commissioner of Patents,

Washington, D. C. 

